Tail slitter



G. E. LAMB TAIL SLITTEIR Aug. 18, 1959 Filed June 25, 1956 INVENTOR.GEO/26E E. LAMB G. E. LAMB TAIL SLITTER Aug. 18, 1959 3 Sheets-Sheet 2Filed June 25, 1956 INVENTOR. 650265 E. L n/-15 r Patented Aug. 18,1959

2,900,025 TAIL SLITTER Ge irge Emerson Lamb, Hoquiam, Wash., assignor toLamb-Grays Harbor Co., Inc., Hoquiam, Wash. 2 Application June 25, 1956,Serial No. 593,507 6 Claims. (Cl. 164-65) This invention relates to amachine associated with and known in the paper making industry as a tailslitter; the machine being designed for use in connection with the drawroll mechanism which draws the paper web from the drier and with thewinder whereby the web, as drawn from the drier, is wound onto spools.

It is the principal object of this invention to provide a simplepractical and automatically operable mechanism whereby the continuouspaper web, which is of substantial width, as extended between the drawrolls that take .it from the drier and a spool of the winder onto whichit is'being wound, can be slit in such manner as to leave only a narrowneck-like retaining connection that can be easily and quickly broken bythe attendant when a change over of the web from a full spool to anempty one is to be made and which in the breaking provides a web endportion that can be easily and readily threaded onto the hub of theempty spool without necessitating the stopping of the winding mechanism.

More specifically stated, the novelty of the present invention residesin the provision of a mechine for making cooperating slits in the paperweb while it is traveling, and to start the two tail forming slits inclose relationship for the purpose above stated and whereby with thebreaking of the neck-like temporary retaining connection provided by theslitting, the forward end of the web, which is to be applied to an emptyspool for winding thereonto, will be forwardly tapered to a narrowthreading portion.

It is a further object of the invention to provide a tail slitter thatstarts the operation by forming two co-extensive slits in the web,located relatively close together and at opposite sides of the centerline of the web, which slits, after continuing substantially parallelfor a short distance to provide the neck-like connection retainingportion, diverge at equal angles, to and through the oppowinder from thedraw rolls until the slitting has been finished and the neck portionbroken.

It is also an object of the present invention to provide a machinewherein slitting is effected by the coaction of paired slitter disks,and which disks are so mounted that they can be moved apart and thenshifted, while spaced, in a direction inwardly across the web withoutslitting it, and then caused to be moved together and thus caused tocoact for the formation of a slit while moving in an outward directionacross the web.

Still further objects of the invention resides in the details ofconstruction of the various parts of the machine; in the functionalrelationship of parts, and in the mode of operation of the machine aswill "hereinafter be fully described.

In accomplishing these and other objects of the invention, I haveprovided the improved details of construction, the preferred forms ofwhich are illustrated in the accompanying drawings, wherein:

Fig. 1 is a side view of the present tail slitter mechanism asfunctionally applied to a draw roll machine to 7 receive the paper webtherethrough for slitting as dehvered to the spools of of the winder.

Fig. 2 is an enlarged elevation of the present tail slitter mechanism,as seen from its right hand side in Fig, 1.

Fig. 3 is a vertical section, taken on line 3-3 in Fig.2.

Fig. 4 is a vertical section, taken on line 4 -4 in Fig. 2.

Fig. 5 is an enlarged cross-section taken on line 5- 5 in Fig. 2.

Fig. 6 is an enlarged sectional view of the left hand pairs of slittersof Fig. 2, in their non-slitting relationship as when moving inwardlyfrom the outer edge of the web toward its center line preparatory to a;tail slitting operation. I

Fig. 7 is a similar view showing the paired slitters as moving away froma starting position and while forming a slit. 0

Fig. 8 is a flat view of the web as cut by the two pairs of slitters.

Fig. 9 is a wiring diagram for the electrical system that controls themachine operation.

In Fig. 1, 10'designated in its entirety, a machine which herein isreferred to as the draw roll machine, and which is equipped with twoco-acting rollers 11-'-11, driven in such manner as to cooperate todrawa paper web 12 from the drier rolls, not herein shown, for itsdelivery to a spool of a winder onto which the web is to be wound. InFig. 1, the winder, which is designated in its entirety by numeral 13,is shown to comprise a frame structure 14 in which spool shafts .15-'15,are rotatably supported at different levels, thus to permit the windingof the paper web first onto a spool at one level and then wound onto thespool at the other level while the paper roll first formed is beingremoved.

Referring now to the tail slitter mechanism which is the subject matterof the present invention: this is designated in its entirety in Fig. 1by numeral 18. As seen best in Fig. 2, it comprises opposite end frames,or housings 2020', rigidly fixed at the same level upon supportingbrackets 21 that are fixed to the opposite side frame members 10x of themachine 10. The lateral spacing of these two housings is substantiallygreaterthan the width of the paper web 12 which passes between them, asnoted by the dotted line showing of the web in Fig. 2. The two housings20-20 are joined across their upper and lower ends, respectively,bybeams 22 and 23 which, in cross-section, preferably are of the hollowform shown in Fig. 5. The upper cross-beam 22 is closed along its bottomside by a flat plate 22x which projects, at its o 'aposite longitudinaledges, beyond the sides of the beam, thus providing flanges, shown at 24in Fig. 5, for a purpose presently explained. Likewise, the lowercross-beam 23 is closed along its top side by a plate 23x which providesprojecting flanges 25 along oppo site side edges of the beam, for apurpose presently explained.

Extending betweenthe upper end portions of the two housings, 20 and 20,are horizontally disposed and paired cross-shafts 26 and 27, each ofwhich is revolubly mounted at its ends in pads 28 that are fixed to theinside walls of the housings. Likewise, extending between the lowerportions of the two housings 20 and 20, are hori zontally disposed andpaired cross-shafts 29 and 30, likewise revolubly supported at theirends in pads 28 that are fixed to the inside walls of the housings.These four shafts are all in the same vertical plane, coextensive, andparallel. At points midway of their ends, the upper and lower pairs ofshafts are revolubly contained in supporting bearing brackets 31 and 32that are fixed respectively to the cross-beams 22 and 23 as shown inFig. 2.

The upper and lower shafts 26 and 30 at opposite sides of the bearingbrackets 31 32 are threaded with 0 right and ,left hand threads,respectively, extending-to -son;and in-the same direction. Also, theshaft-26 is equipped at its extended end with a sprocket wheel 36 whichis driven by a sprocket chain belt 37 operating thereover and overasmall sprocket wheel 38 fixed on a housing 20' and are there I rierhousing along the driven shaft 39 of gear reduction mechanism 39xassociated with a reversible electric motor 40 that is mounted 'uponcross-beam-22 at the right hand end of'the frame structure as seen inFig. 2. V

j The shafts 27 and 29, as observed in Fig. 2, are not threaded, andboth extend at'their left hand ends through their mounting pads 28 tothe inside of the housing and are there equipped, respectively, withdriving sprocket wheels; 41 and 42 about which a sprocket chain belt 43-operates to drive the shafts in unison; belt 43 being extendedalsoovera. driving-sprocket 44' fixed on the driven shaft 45 of a gearreduction mechanism-45x associated with an electric motor 46 mounted onthe cross-beam 22 at the left hand end of the machine as shown; Fig. 2.The belt'43 operates about the sprockets 41 and 42 in the manner shownin Fig. 3, to drive the shafts 27 and 29 in opposite directions.

It isshown in Fig. 3 that the drive belt 43 is engaged by an adjustablebelt'tightener sprocket wheels 47 mounte d'on housing 20,- and'likewise,the belt 35 as seen in Fig. 4, is engaged by an adjustably mounted belttightener sprocket 48,-thus to keep the belts properly engaged withtheir" sprocket wheels.

Mounted on the upper paired shafts 26 and 27, at opposite sides of thecentrally located supporting brackets 31, are what are designated ascutter carrier housings 50 and 50'. Each of thesehousings is of invertedU-shaped forrnywith-its upper end or base portion bored, as at 51 inFigs. 6 and 7, for passage of the threaded shaft 26 therethrough. Also,the opposite leg portions of the housings have horizontally alignedopenings '52 formed therein for the mounting therein of bearings and thepassing therethrough of the shaft 27 as presently explained.- I

. -The base,-or top ends of each of the carrier housing 50 --50 isrecessed, as shown at 53, in Fig; 5, to receive ever, these nuts 56'each has a predetermined and limited I endwise travel in its containingbore;- being limited in moving inopposite-directions by its coming intoabutment, at its ends, with stop plates 58--58' that are applied'to theopposite ends of thecarrier housings about the shaft 26, and overopposite ends of secured by screw bolts 59. r

; The arrangement of the nuts 56 inthe bores 51 of the twocarrierhousing5050', as applied to shaft 26, is such that when the shaft rotates in'adirection to move the housings inwardly along the shaft, the nuts, whichare keyed against turning therewith, will travel inwardly in the boresuntil they are stopped by engagement at their inner ends With the innerstop plates. Then as shaft 26 continues to rotate, the nuts operate topush the carrier housings inwardly along the beam 22 and shafts 26 and27. When the direction of rotation of shaft 26 is reversed, the nuts 56reverse in direction and move toward the outer ends of their containingbores, and-finally come into abutment with the stop plates at outer endsof the ,bore '51. Each nut then operates to slide its carthe bores 51and beam 22 and the shafts 26 and 27 in the outward direction.

It is noted also in Fig. 2. that carrier housings 60 and 60' of U-shapedform are applied to the lower paired shafts 29 and 30, and lowercross-beam 23 for travel therealong, to move toward or away from eachother according to direction of rotation of the shaft 30. These carrierhousing are like the carrier housings previously described and areadapted to travel inthe same manner along the beam 23 as the upperhousings travel along beam 22. fHowever, their motivating connectionswith the shaft 30, are as seen in the lower portion of Fig. 6, whichshows the bore 51x that is formed through the base of the carrierhousing to be fitted with a cylindrical nut 65 that is fixed thereinagainst any relative rotation and longitudinal movement. .Thus, whenshaft 30 changes; in its direction of rotationfthe' direction oftravel:offthe carrie'r. housings"change, .but without any lost motion asisprovided for in the upper set of carrier housings. t

Revolubly mounted between the downwardly directed leg portions of theupper set of carrier housings, 50-50 .as at 71a-:-71a, to be driven bythe shaft and to provide for their longitudinal travel thereon under theinfluence of the carriers as moved by the turning of shaft 26;

Each collar 70 has a circumferential flange 73, and clamped against theinside face of this flange, by a clamp nut 74 threaded onto the collaris a cutter disk 75 with beveled shearing edge 76;

Likewise mounted between the upwardly directed and spaced legsof thecarrier housings 60--60 as appliedto the lower set or paired shafts 29and '30, are hubs 78', with mounting end trunnions 79 carried inanti-friction bearings 80 fitted in openings in the legs. These hubs arekeyed, as at 81, for driving by and for longitudinal shifting on theshafts 29. Keyed on each hub, as at 83, is. a collar 84. with acircumferential flange against which a shearing disk 86 is seated andsecured by a clamp put 87 threaded onto the collar and against the disk.The disks 86 of these lower carriers are so arranged 'as to coact withthe disks 75 of the upper carrier under certain conditions, as has beenillustrated in Fig. 7, for the slitting'of thep'aper web 12 as presentlyexplained.

It is to be observed in Fig. 6, that'the collar 84 is urged by a coiledspring39 toward the coacting disk 86. 'However, the spring will yieldunder pressure, to accommodate the shearing'disk' to the material thatis beingslit thereby.

- 'With' the slitter mechanism 18 applied in the manner shown 'in Fig.1; and a web 12'of paper or pulp passed through it and being wound ontoa spool 15-, and with the paired upper and lower sets of slitter disksdisposed at the outer ends of their paired carrier shafts, beyond theedge limits of the paper web, as indicated in dotted lines in. Fig. 2,'assume that it is desirable to slit the web to provide a tail that isadapted to be broken thus to de' tach the web from the roll and permitthe roll to be lifted from the winder and the end of the tail as comingfrom the slitter, applied to the lower spool 15 for starting anotherroll: The operator first energizes motor 40 which operates through belts'37 and 35 to drive the screwshafts 26 and 30 at the same speed and insuch direction as tocau'se the .two sets of carrier housings to be movedinwardly toward the center line of the web. Although the rotation ofshaft 26 starts at the same instant the shaft-'30 is started, thecarrier housings 5050' mountedthereon do no'timmediatelystart tomovei'n' wardly, this being due tofthe fact that their moving nuts 56have'the' lost motion, 'slidin'g relationship in the bores 51 thatallows the lowercarriers, which start inwardly with'thejturning'of-the'shafti30, to move in advance of the upper set, asindicated by the lateral spacing in which they are shown in Fig. 6. Inthis spaced relationship the cutters can move inwardly across the topand bottom faces of the web 12 without tearing or in any way damagingit. When the lower slitter disks of the two lower carriers reach apredetermined spacing, the motor 40 is automatically stopped. Thisleaves the coacting pairs of slitters at each side of the center line inthe laterally spaced relationship shown in Fig. 2.

While this inward travel of the slitters is taking place the webcontinues to be wound on the roll 15.

When it is desired to start the slitting operation both motors 40 and 46are energized, but this time the motor 40 is reversed in direction. Withthe turning of shaft 30, the carrier housings 60-60 begin moving apart,at the samespeed. At the same instant these lower carrier housings startoutwardly, the sliding nuts 56, as then contained at the inner ends ofthe bores 51 of the upper carrier housings start moving outwardly, andwhen they engage against the stop plates 58 covering the outer ends ofthe bores, the upper carriers then start moving apart. However, thetiming and arrangement of parts is so determined that the coacting upperand lower disks are brought into shearing contact immediately beforethis takes place so that the coiled springs 89 will maintain the desiredcutting tension between the paired slitting disks.

As soon as the coacting disks have been pressed into shearing contact asin Fig. 7, the two sets of cutters start moving apart at the same speed,thus forming diverging slits that lead to and through opposite edges ofthe web.

The slitting of the web, as formed by the two sets ofcutters, is asshown in Fig. 8 wherein p and p designate short parallel slitsrelatively close to the center line of the web, as formed by the upperand lower slitting disks while the disks are moving into shearingrelationship but before the nuts 56 have come into end abutment with thestop plates to move the carrier housings outward along their shafts. Thediverging slits are designated at d and d. With the slits thus made, theattendant then breaks the narrow neck portion, and carries it forwardlyand applies it to the empty spool 15 which then starts winding in theweb thereon. The filled spool may then be removed.

All operations are under control of the electrical system shown, in Fig.9 which will now be explained.

The electrical circuitry is supplied with current through the main linesL1, L2 and L3. These main lines provide regular three-phase alternatingcurrent to the travel motor 40 and the slitting motor 46 through aplurality of solenoid operated motor contactors designated at 100, 101and 102. The motor contactor 101 controls the forward running of thetravel motor 40 to thus drive the slitter supports 50, 50', 60 and 60'inwardly towards the center of the frame structure 22. The motorcontactor 101 controls the reverse running of the travel motor 40 tothus drive the slitter supports outwardly from the center of the framestructure 22 and towards the edge of the paper 12. It will be not thatthe motor contactors 100 and 101 areprovided with normally closedinterlocking and co-acting switches 103 and 104, respectively whichbecome open with the actuation of the particular contactor with which itis mechanically linked, thus to prevent the actuation of more than oneof the contactors 100 or 101 at any time by preventing the flow ofcurrent through one of the lines 105 or 106, to either of the associatedsolenoid coils, 107 or 108.

The motor contactor 102 controls the running of the slitting motor'46which is arranged to run in one direction only.

Branching off from two of the main lines L1 and L2 are paired lines 110and '111 which supply current at original voltage to the primary side ofa step-down transformer T. The secondary side of the transformer T isconnectedto a pair of feed lines 1 12 and 113 which distribute lowvoltage current to the various control switches embodied in thisinvention. These switches include two manually operated push button typestarter switches 115 and 116. The so-called in button 115 is used toinitially energize the contactor to thus start the travel motor 40 in aforward direction to move the slitter supports inwardly towards thecenter of the machine. The contactor 100 is self-holding through aholding switch 117 associated therewith. The so-called our button 116 isused to initially energize not merely the travel motors'reversingcontactor 101 but also the contactor 102 which starts the slitter motor46. After an initial energization, both of these latter contactors, i.e.101 and 102 are self-holding, as-will be explained later, through asingle holding switch 118.

Certain automatic switches are also included in this invention, theseinclude a limit switch 119 which automatically stops the travel motor 40when the slitters have moved inwardly as far as they should go, see Fig.2. Similarly a second limit switch 121 automatically stops the travelmotor 40 when the slitters have moved outwardly as far as they shouldgo. Furthermore, a double-acting so-called tail switch 122, theoperation of which will be explained in detail later, is inserted intothe circuit to temporarily shut off the travel motor 40 so as tointerrupt the outward travel of the slitters as soon as the slittershave moved outwardly far enough to come into slitting position andshearing contact with each other. It is during this interruption oftravel of the slitters that they perform the operation of travel of theslitters that they perform the operation, of cutting the straightportion, p, p, of the tail, as seen in Fig. 8. As will be explained indetail hereinafter, a time relay switch 127 is connected to the tailswitch 122 in such manner as to restart the travel motor 40 after ashort time interval and thus permit the slitters to make the diagonalcuts d and d of Fig. 8 as they proceed to move outwardly towards theedge .of the sheet.

The detailed operation of the present invention is as follows:

When the operator desires to prepare the machine for the cutting of atail in the paper he momentarily presses and closes the push buttonswitch which is the socalled in button. This results in current flowingfrom the vfeed line 112 through the normally closed limit switch 119,through lines and 106 to energize the solenoid coil 108 of the motorcontactor 100. When the motor contactor 100' is thus actuated, it notonly closes the holding switch 117 to by-pass the in button 115 forcontinued energization of coil 108, but also causes the high voltagecurrent to flow through the lines 130, 131 and 132 to the travel motor40 to start the latter so that it begins moving the slitter supports 50,50' and 60 and 60' inwardly towards the center of the paper sheet 12.However, because of the slip keys 56 embodied in the upper slittersupports 50 and 50", these particular slitters will lag behind the lowerslitter supports 60 and 60' so as to cause a lateral displacementbetween the cutting knives 75 and 86 while they are moving inwardlytowards the center of the paper sheet. This prevents any shearing orcutting action, upon the paper. Also, at this same time, the slitterknives 75 and 86 are not rotating since the slitter motor 46 isinactive.

As soon as the slitter supports have reached their inward limit oftravel, as illustrated by the solid lines in Fig. 2, the limit switch119 will be automatically opened by the lateral movement of theslittersupport 50, to thus break the current to lines 120 and 106 and cause thede-actuation of contactor 100 and the consequent stopping of travelmotor 40. It might be pointed out here that the inward movement of theslitter support 50 has no effect upon the switch 122 in Fig. 2 as itpasses the latter.

In order to start the machine cutting a tail, the opera tor momentarilypresses the push button, or so-called 'i.e., 137, 138, 139, 134 135, 140and 105.

fout button 116. This feeds current from line 112 through the button 116and into two other lines 134 and 135 which ultimately feed currentthrough the lines 136 and 105 respectively, to energize the solenoidcoils 129 and 107. The energizing of solenoid coils 129 and 107 willcause the actuation of the motor contactors 102 and 101 respectively, tothus start the slitter motor 46 and the travel motor 40.

The actuation of contactor 102 causes the closing of a holding switch118 to enable the by-passing of the push button 116 and thus feedcurrent to the solenoid coil 129 via the lines 137, 13$, 139 and 136 topermit the continued running of slitter motor 46 even after the releaseand opening of button 116'. Similarly, an alternate path for current isprovided to solenoid coil 107 via the lines 137, 138, 139, 135, 140 and105 to permit the continued running of travel motor 40 after thereleaseof button 116.

With the start of the travel motor 40, the slitter supports 50, 50 and60 and 60 start moving apart towards the edge of the paper. Again,because of the slip-keys 56, the upper slitters 50 and 50 will lagenough the allow the lower slitters 60 and 60' to catch up and come intoshearing contact with them and thus actually start shearing the papertherebetween. At approximately this same instant the upper slittersupport 50, on its return travel, will strike the lever arm 123 of Fig.2 of the tail switch 122 and cause the opening of contacts 124, Fig. 9;This, of course, breaks the current to the solenoid coil 107 so that thetravel'motor 40 will stop as a result thereof. It is at this time thatthe straight portion p,

Fig. 8 of the tail is being cut since there is no lateral movement ofthe slitter knives, although they continue to rotate and shear the paperas it is being pulled through the machine.

However, the halt in the lateral or outward travel of the slitter knivesis only temporary. The aforementioned actuation of the tail switch 122has in the meantimelcaused the closing of the contacts 125 of the saidtail switch and this provided a flow of current to a heating element 126in the time relay switch 127. The heating of the element 126 will cause,after a short time, theclosing of contacts 128. As soon as the contacts123 become closed, current is supplied via lines 137, 141, 142, 140 and105 to the solenoid coil 107 thus causing the restart of travel motor40. Thus, the slitters start moving outwardly once again. As soon as theslitter support 50 passes the switch arm 123 and releases it, the switch122 again assumes its normal position with contacts 124 closed. The timerelay 127 is thus again de-actuated and solenoid coil 107 is onceagainreceiving current from the same lines as before,

It is during this particular period of time the diagonal cuts d, Fig. 8,are being made since both the travel motor 40 and the slitter motor 46are in operation. This cutting continues until the slitters have movedall the way outwardly and until the limit switch 121 is actuated andopened by the outward travel of the slitter support 54}. Thereupon, thetail slitting portion of the machine comes to rest and the cycle iscompleted.

' What I claim as new is:

l. The combination with means for supporting and advancing a paper webor the like, of a tail slitting mechanism comprising a pair of paralleland revolubly driven shafts extended across the web at opposite sidesthereof, paired disk-cutters slidably keyed on said shafts and movabletherealong between outer positions, beyond the oppos ide side edges ofthe web, and inner positions closely adjacent the longitudinal centerline of the web, threaded shafts located at opposite sides of the web,parallel to and coextensive with the first mentioned shafts, carrierhousings mounted on said threaded shafts corresponding to thedisk-cutters, means for rotating said threaded shafts in'unison in onedirection to cause the two carrier housings 'oneacli to move inwardlytherealong in unison from beyond opposite side edges of the web to theirinnerlimits of travel, and for rotating said shafts'in the oppositedirection to causethe carrier housings to move outwardly therealong inunison; each of the carrierrhousings,.as associated with one of saidthreaded shafts, having a sleeve-like actuating element threaded on theshaft, and keyedfor' limited endwise sliding insaid housing, thusproviding a lost motion connection between housing. and shaft wherebytravel of the corresponding disk-cutter under influence of that housingis delayed at the start of the turning of said threaded shafts for aninward moving operation, thus to provide for the relative adjustment ofthe complemental disks to non-functional relationship, and at the startof the subsequent reverse turning of said shafts to cause saiddisk-cutters to be brought'back to their coacting relationship forslitting the web.

2. The combination recited in claim 1 wherein said threaded shafts aredriven in unison for moving the carrier housings therealong by areversible electric motor, a circuit for the motor and limit switches insaid circuit disposed in positions for actuation by one of said carrierhousings as it reaches its opposite limits of travel.

3. The combination recited in claim 1 wherein the disk cutter drivingshafts are driven by an electric motor, and said threaded shafts aredriven in unison by a reversible electric motor, an electric circuit foreach motor, limit switches in the circuit for the reversible motor,disposed in positions for actuation by one of the carrier housings as itreaches its opposite limits of travel, and a double acting switchbetween and operated by said one of the carrier housings to stop thereversible motor temporarily, as the cutters come into their shearingrelationship at the beginning of their outward travel.

4. A paper slitting machine of the character described including meansfor supporting and advancing a paper web or the like through themachine, the paper slitting mechanism comprising a pair of parallel andrevolubly driven shafts that extend across the web and between which theweb passes, paired disk cutters mounted on and freely movable along saidshafts, rotatable threaded shafts located at opposite sides of. the webparallel to and coextensive with said driven shafts,'cutter moving meanson said threaded shafts engageable with each disk cutter andfunctionally engageable therewith, means for rotating said threadedshafts in unison whereby the cutter moving means are caused to moveinwardly or outwardly along the threaded shafts and means operableincident to engagement by one of the cutter moving means for controllingthe rotation of the thread shafts and means to cause the paired diskcutters to move out of coacting relationship when the cutters are movedinwardly toward the center of the shafts and to move the paired diskcutters into coacting relationship when the cutters move outwardly onthe shafts.

5. A paper slitting machine as in claim 4 including rotatable, threadedshafts located at opposite sides of the web and parallel to said drivenshafts, said cutter moving means being mounted on said threaded shaftsand means for rotating said thread shafts.

6. A paper slitting machine as in claim 5 wherein means is provided forreversing the rotation of the threaded shafts and thereby causing thecarrier housings to move inwardly or outwardly incident to the directionof rotation.

References Cited in the file of this patent UNITED STATES PATENTS204,145 Ford May 28,1878 801,036 McCorkindale Oct. 3, 1905 2,629,441Eager Feb. 24, 1953 2,672,198 Jones et al Mar. 16, 1954 2,698,662 MoodyJan. 4, 1955 2,713,903 Smith July 26, 1955 FOREIGN PATENTS 483,107Germany .-..i Oct; 4, 1929

